Source file src/github.com/json-iterator/go/extra/privat_fields.go

Documentation: github.com/json-iterator/go/extra

     1  package extra
     2  
     3  import (
     4  	"github.com/json-iterator/go"
     5  	"strings"
     6  	"unicode"
     7  )
     8  
     9  // SupportPrivateFields include private fields when encoding/decoding
    10  func SupportPrivateFields() {
    11  	jsoniter.RegisterExtension(&privateFieldsExtension{})
    12  }
    13  
    14  type privateFieldsExtension struct {
    15  	jsoniter.DummyExtension
    16  }
    17  
    18  func (extension *privateFieldsExtension) UpdateStructDescriptor(structDescriptor *jsoniter.StructDescriptor) {
    19  	for _, binding := range structDescriptor.Fields {
    20  		isPrivate := unicode.IsLower(rune(binding.Field.Name()[0]))
    21  		if isPrivate {
    22  			tag, hastag := binding.Field.Tag().Lookup("json")
    23  			if !hastag {
    24  				binding.FromNames = []string{binding.Field.Name()}
    25  				binding.ToNames = []string{binding.Field.Name()}
    26  				continue
    27  			}
    28  			tagParts := strings.Split(tag, ",")
    29  			names := calcFieldNames(binding.Field.Name(), tagParts[0], tag)
    30  			binding.FromNames = names
    31  			binding.ToNames = names
    32  		}
    33  	}
    34  }
    35  
    36  func calcFieldNames(originalFieldName string, tagProvidedFieldName string, wholeTag string) []string {
    37  	// ignore?
    38  	if wholeTag == "-" {
    39  		return []string{}
    40  	}
    41  	// rename?
    42  	var fieldNames []string
    43  	if tagProvidedFieldName == "" {
    44  		fieldNames = []string{originalFieldName}
    45  	} else {
    46  		fieldNames = []string{tagProvidedFieldName}
    47  	}
    48  	// private?
    49  	isNotExported := unicode.IsLower(rune(originalFieldName[0]))
    50  	if isNotExported {
    51  		fieldNames = []string{}
    52  	}
    53  	return fieldNames
    54  }
    55  

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